<template>
	<div>
		<!-- 面包屑导航区 -->
		<el-breadcrumb separator-class="el-icon-arrow-right">
			<el-breadcrumb-item :to="{ path: '/home' }"
				>首页</el-breadcrumb-item
			>
			<el-breadcrumb-item>商品管理</el-breadcrumb-item>
			<el-breadcrumb-item>参数分类</el-breadcrumb-item>
		</el-breadcrumb>

		<!-- 卡片视图区域 -->
		<el-card>
			<!-- 警告区域 -->
			<el-alert
				show-icon
				title="注意: 只允许为第三极分类设置相关参数!"
				type="warning"
				:closable="false"
			></el-alert>

			<!-- 选择商品分类区域 -->
			<el-row class="cat_opt">
				<el-col>
					<span>选择商品分类: </span>
					<!-- 选择商品分类的级联选择框 -->
					<el-cascader
						expand-trigger="hover"
						:options="catelist"
						:props="cateProps"
						v-model="selectedCateKeys"
						@change="handleChange"
					>
					</el-cascader>
				</el-col>
			</el-row>

			<!-- tab 页签区域 -->
			<el-tabs v-model="activeName" @tab-click="handleTabClick">
				<!-- 添加动态参数的面板 -->
				<el-tab-pane label="动态参数" name="many">
					<!-- 添加参数的按钮 -->
					<el-button
						type="primary"
						size="mini"
						:disabled="isBtnDisabled"
						@click="addDialogVisible = true"
						>添加参数</el-button
					>
					<!-- 动态参数表格 -->
					<el-table :data="manyTableData" border stripe>
						<!-- 展开行 -->
						<el-table-column type="expand">
							<template slot-scope="scope">
								<!-- 循环渲染Tag标签 -->
								<el-tag
									v-for="(item, i) in scope.row.attr_vals"
									:key="i"
									closable
									@close="handleClose(i, scope.row)"
								>
									{{ item }}
								</el-tag>
								<!-- 输入的文本框 -->
								<el-input
									class="input-new-tag"
									v-if="scope.row.inputVisible"
									v-model="scope.row.inputValue"
									ref="saveTagInput"
									size="small"
									@keyup.enter.native="
										handleInputConfirm(scope.row)
									"
									@blur="handleInputConfirm(scope.row)"
								>
								</el-input>
								<!-- 添加按钮 -->
								<el-button
									v-else
									class="button-new-tag"
									size="small"
									@click="showInput(scope.row)"
									>+ New Tag</el-button
								>
							</template>
						</el-table-column>
						<!-- 索引列 -->
						<el-table-column
							type="index"
							label="#"
						></el-table-column>
						<el-table-column label="参数名称" prop="attr_name">
						</el-table-column>
						<el-table-column label="操作">
							<template slot-scope="scope">
								<el-button
									type="primary"
									icon="el-icon-edit"
									size="mini"
									@click="showEditDialog(scope.row.attr_id)"
								>
									编辑
								</el-button>
								<el-button
									type="danger"
									icon="el-icon-delete"
									size="mini"
									@click="removeParams(scope.row.attr_id)"
								>
									删除
								</el-button>
							</template>
						</el-table-column>
					</el-table>
				</el-tab-pane>
				<!-- 添加动态参数的面板 -->
				<el-tab-pane label="静态属性" name="only">
					<!-- 添加属性的按钮 -->
					<el-button
						type="primary"
						size="mini"
						:disabled="isBtnDisabled"
						@click="addDialogVisible = true"
						>添加属性</el-button
					>
					<!-- 静态属性表格 -->
					<el-table :data="onlyTableData" border stripe>
						<!-- 展开行 -->
						<el-table-column type="expand">
							<template slot-scope="scope">
								<!-- 循环渲染Tag标签 -->
								<el-tag
									v-for="(item, i) in scope.row.attr_vals"
									:key="i"
									closable
									@close="handleClose(i, scope.row)"
								>
									{{ item }}
								</el-tag>
								<!-- 输入的文本框 -->
								<el-input
									class="input-new-tag"
									v-if="scope.row.inputVisible"
									v-model="scope.row.inputValue"
									ref="saveTagInput"
									size="small"
									@keyup.enter.native="
										handleInputConfirm(scope.row)
									"
									@blur="handleInputConfirm(scope.row)"
								>
								</el-input>
								<!-- 添加按钮 -->
								<el-button
									v-else
									class="button-new-tag"
									size="small"
									@click="showInput(scope.row)"
									>+ New Tag</el-button
								>
							</template>
						</el-table-column>
						<!-- 索引列 -->
						<el-table-column
							type="index"
							label="#"
						></el-table-column>
						<el-table-column label="属性名称" prop="attr_name">
						</el-table-column>
						<el-table-column label="操作">
							<template slot-scope="scope">
								<el-button
									type="primary"
									icon="el-icon-edit"
									size="mini"
									@click="showEditDialog(scope.row.attr_id)"
								>
									编辑
								</el-button>
								<el-button
									type="danger"
									icon="el-icon-delete"
									size="mini"
									@click="removeParams(scope.row.attr_id)"
								>
									删除
								</el-button>
							</template>
						</el-table-column>
					</el-table>
				</el-tab-pane>
			</el-tabs>
		</el-card>

		<!-- 添加参数的对话框 -->
		<el-dialog
			:title="'添加' + titleText"
			:visible.sync="addDialogVisible"
			width="50%"
			@close="addDialogClosed"
		>
			<!-- 添加参数的对话框 -->
			<el-form
				:model="addForm"
				:rules="addFormRules"
				ref="addFormRef"
				label-width="100px"
			>
				<el-form-item :label="titleText" prop="attr_name">
					<el-input v-model="addForm.attr_name"></el-input>
				</el-form-item>
			</el-form>
			<span slot="footer" class="dialog-footer">
				<el-button @click="addDialogVisible = false">取 消</el-button>
				<el-button type="primary" @click="addParams">确 定</el-button>
			</span>
		</el-dialog>

		<!-- 修改参数的对话框 -->
		<el-dialog
			:title="'修改' + titleText"
			:visible.sync="editDialogVisible"
			width="50%"
			@close="editDialogClosed"
		>
			<!-- 添加参数的对话框 -->
			<el-form
				:model="editForm"
				:rules="editFormRules"
				ref="editFormRef"
				label-width="100px"
			>
				<el-form-item :label="titleText" prop="attr_name">
					<el-input v-model="editForm.attr_name"></el-input>
				</el-form-item>
			</el-form>
			<span slot="footer" class="dialog-footer">
				<el-button @click="editDialogVisible = false">取 消</el-button>
				<el-button type="primary" @click="editParams">确 定</el-button>
			</span>
		</el-dialog>
	</div>
</template>

<script>
export default {
	data() {
		return {
			// 商品分类列表
			catelist: [],
			// 级联选择框的配置对象
			cateProps: {
				value: 'cat_id',
				label: 'cat_name',
				children: 'children',
			},
			// 级联选择框双向绑定到的数组
			selectedCateKeys: [],
			// 被激活的页签的名称
			activeName: 'many',
			// 动态参数的数据
			manyTableData: [],
			// 静态属性的数据
			onlyTableData: [],
			// 控制添加对话框的显示与隐藏
			addDialogVisible: false,
			// 添加参数的表单数据对象
			addForm: {
				attr_name: '',
			},
			// 添加表单的验证规则对象
			addFormRules: {
				attr_name: [
					{
						required: true,
						message: '请输入参数名称',
						trigger: 'blur',
					},
				],
			},
			// 控制修改对话框的显示与隐藏
			editDialogVisible: false,
			// 修改的表单数据对象
			editForm: {},
			// 修改表单的验证规则对象
			editFormRules: {
				attr_name: [
					{
						required: true,
						message: '请输入参数名称',
						trigger: 'blur',
					},
				],
			},
		};
	},
	created() {
		this.getCateList();
	},
	methods: {
		// 获取所有的商品分类列表
		async getCateList() {
			const { data: res } = await this.$http.get('categories');
			if (res.meta.status !== 200) {
				return this.$message.error('获取商品分类失败');
			}

			this.catelist = res.data;
			console.log(this.catelist);
		},
		// 级联选择框选中项变化, 会触发这个函数
		handleChange() {
			this.getParamsData();
		},
		// tab 页签点击事件的处理函数
		handleTabClick() {
			console.log(this.activeName);
			this.getParamsData();
		},
		// 获取参数的列表数据
		async getParamsData() {
			// 证明选中的不是三级分类
			if (this.selectedCateKeys.length !== 3) {
				this.selectedCateKeys = [];
				this.manyTableData = [];
				this.onlyTableData = [];
				return;
			}

			// 证明选中的是三级分类
			console.log(this.selectedCateKeys);
			// 根据所选分类的Id, 和当前所处的面板, 获取对应的参数
			const { data: res } = await this.$http.get(
				`categories/${this.cateId}/attributes`,
				{
					params: { sel: this.activeName },
				}
			);
			if (res.meta.status !== 200) {
				return this.$$message.error('获取参数列表失败');
			}

			res.data.forEach((item) => {
				item.attr_vals = item.attr_vals
					? item.attr_vals.split(' ')
					: [];
				// 控制文本框的显示与隐藏
				item.inputVisible = false;
				// 文本框中输入的值
				item.inputValue = '';
			});

			console.log(res.data);

			if (this.activeName === 'many') {
				this.manyTableData = res.data;
			} else {
				this.onlyTableData = res.data;
			}
		},
		// 监听添加对话框的关闭事件
		addDialogClosed() {
			this.$refs.addFormRef.resetFields();
		},
		// 点击按钮, 添加参数
		addParams() {
			this.$refs.addFormRef.validate(async (valid) => {
				if (!valid) {
					return;
				}
				const { data: res } = await this.$http.post(
					`categories/${this.cateId}/attributes`,
					{
						attr_name: this.addForm.attr_name,
						attr_sel: this.activeName,
					}
				);
				if (res.meta.status !== 201) {
					return this.$message.error('添加参数失败');
				}
				this.$message.success('添加参数成功!');
				this.addDialogVisible = false;
				this.getParamsData();
			});
		},
		// 点击按钮, 展示修改的对话框
		async showEditDialog(attr_id) {
			// 查询当前参数的信息
			const { data: res } = await this.$http.get(
				`categories/${this.cateId}/attributes/${attr_id}`,
				{
					params: { attr_sel: this.activeName },
				}
			);
			if (res.meta.status !== 200) {
				return this.$message.error('获取参数信息失败');
			}
			this.editForm = res.data;
			this.editDialogVisible = true;
		},
		// 重置修改表单
		editDialogClosed() {
			this.$refs.editFormRef.resetFields();
		},
		// 点击按钮, 修改参数信息
		editParams() {
			this.$refs.editFormRef.validate(async (valid) => {
				if (!valid) return;
				const { data: res } = await this.$http.put(
					`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
					{
						attr_name: this.editForm.attr_name,
						attr_sel: this.activeName,
					}
				);
				if (res.meta.status !== 200) {
					return this.$message.error('修改参数失败');
				}
				this.$message.success('修改参数成功');
				this.getParamsData();
				this.editDialogVisible = false;
			});
		},
		// 根据ID删除对应的参数项
		async removeParams(attr_id) {
			const confirmResult = await this.$confirm(
				'此操作将永久删除该参数, 是否继续?',
				'提示',
				{
					confirmButtonText: '确定',
					cancelButtonText: '取消',
					type: 'warning',
				}
			).catch((err) => err);

			// 用户取消了删除的操作
			if (confirmResult !== 'confirm') {
				return this.$message.info('已取消删除');
			}

			// 删除的业务逻辑
			const { data: res } = await this.$http.delete(
				`categories/${this.cateId}/attributes/${attr_id}`
			);
			if (res.meta.status !== 200) {
				return this.$message.error('删除参数失败');
			}

			this.$message.success('删除参数成功');
			this.getParamsData();
		},
		// 文本框失去焦点, 或按下 Enter 都会触发
		async handleInputConfirm(row) {
			if (row.inputValue.trim().length === 0) {
				row.inputValue = '';
				row.inputVisible = false;
				return;
			}
			// 如果没有return, 则证明输入了内容,需要做后续处理
			row.attr_vals.push(row.inputValue.trim());
			row.inputValue = '';
			row.inputVisible = false;
			// 需要发起请求, 保存这次操作
			this.saveAttrVals(row);
		},
		// 将对 attr_vals 的操作保存到数据库
		async saveAttrVals(row) {
			// 需要发起请求, 保存这次操作
			const { data: res } = await this.$http.put(
				`categories/${this.cateId}/attributes/${row.attr_id}`,
				{
					attr_name: row.attr_name,
					attr_sel: row.attr_sel,
					attr_vals: row.attr_vals.join(' '),
				}
			);

			if (res.meta.status !== 200) {
				return this.$message.error('修改参数项失败');
			}

			this.$message.success('修改参数项成功');
		},
		// 点击按钮, 展示文本输入框
		showInput(row) {
			row.inputVisible = true;
			// 让文本框自动获得焦点
			// $nextTick 方法的作用, 就是当页面上元素被重新渲染之后, 才会执行回调函数中的代码
			this.$nextTick((_) => {
				this.$refs.saveTagInput.$refs.input.focus();
			});
		},
		// 删除对应的参数和选项
		handleClose(i, row) {
			row.attr_vals.splice(i, 1);
			this.saveAttrVals(row);
		},
	},
	computed: {
		// 如果按钮需要被禁用, 则返回true, 否则返回 false
		isBtnDisabled() {
			if (this.selectedCateKeys.length !== 3) {
				return true;
			}
			return false;
		},
		// 当前选中的三级分类的Id
		cateId() {
			if (this.selectedCateKeys.length == 3) {
				return this.selectedCateKeys[2];
			}
			return null;
		},
		// 动态计算标题的文本
		titleText() {
			if (this.activeName === 'many') {
				return '动态参数';
			}
			return '静态属性';
		},
	},
};
</script>

<style lang="scss" scoped>
.cat_opt {
	margin: 15px 0;
}
.el-tag {
	margin: 10px;
}
.input-new-tag {
	width: 120px;
}
</style>
